RESEARCH ARTICLE

Mechanical and geometric advantages in compliant mechanism optimization

  • Michael Yu WANG
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  • Department of Mechanical & Automation Engineering, The Chinese University of Hong Kong, Hong Kong, China

Received date: 27 Feb 2009

Accepted date: 20 Mar 2009

Published date: 05 Sep 2009

Copyright

2014 Higher Education Press and Springer-Verlag Berlin Heidelberg

Abstract

This paper presents a focused examination of the mechanical and geometric advantages in compliant mechanisms and their ramifications in the design formulations of compliant mechanisms posed as a topology optimization problem. With a linear elastic structural analysis, we quantify mechanical (and geometric) advantage in terms of the stiffness elements of the mechanism's structure. We then analyze the common formulations of compliant mechanism optimization and the role of the external springs added in the formulations. It is shown that the common formulations using mechanical (or geometric) advantage would directly emulate at best a rigid-body linkage to the true optimum design. As a result, the topology optimization generates point flexures in the resulting optimal mechanisms. A case study is investigated to demonstrate the resulting trends in the current formulations.

Cite this article

Michael Yu WANG . Mechanical and geometric advantages in compliant mechanism optimization[J]. Frontiers of Mechanical Engineering, 2009 , 4(3) : 229 -241 . DOI: 10.1007/s11465-009-0066-1

Acknowledgements

This research work was supported in part by the Research Grants Council of Hong Kong SAR (Project Nos. CUHK416507 and CUHK417708). The author would like to thank Dr. Zen Luo for producing the results in Fig. 6.
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